Optical Fiber Rohan Educational Solutions offers range of optical fibers and patch cables based on single mode (SM), polarization maintaining (PM), multimode (MM), or special fibers (e.g., photonic crystal, double clad, and rare-earth doped) fiber. Single Mode Fiber Multi Mode Fiber Photonics Crystal Fiber Bend Insensitive Fiber Polarization Maintaing Fiber Double Clad Fiber Non-Zero Dispersion-Shifted Fiber Photosensitive Single Mode FiberErbium Doped Fiber Bare Fiber Spool Plastic Fiber